scholarly journals Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds

1999 ◽  
Vol 39 (5-6) ◽  
pp. 617-624 ◽  
Author(s):  
D. Fernandez-Abella ◽  
D. Becu-Villalobos ◽  
I. M. Lacau-Mengido ◽  
N. Villegas ◽  
O. Bentancur
Keyword(s):  
Sperm Production ◽  
Testosterone Levels ◽  
Testicular Size

scholarly journals Probiotic Microbes Sustain Youthful Serum Testosterone Levels and Testicular Size in Aging Mice

PLoS ONE ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. e84877 ◽  
Author(s):  
Theofilos Poutahidis ◽  
Alex Springer ◽  
Tatiana Levkovich ◽  
Peimin Qi ◽  
Bernard J. Varian ◽  
...  
Keyword(s):  
Serum Testosterone ◽  
Testosterone Levels ◽  
Testicular Size ◽  
Probiotic Microbes

Developmental hormonal profiles accompanying the neonatal hypothyroidism-induced increase in adult testicular size and sperm production in the rat.

Endocrinology ◽  
1992 ◽  
Vol 131 (2) ◽  
pp. 559-565
Author(s):  
J D Kirby ◽  
A E Jetton ◽  
P S Cooke ◽  
R A Hess ◽  
D Bunick ◽  
...  
Keyword(s):  
Sperm Production ◽  
Neonatal Hypothyroidism ◽  
Hormonal Profiles ◽  
Testicular Size

Comparison of a modified cryptorchid treatment and castration: effect on growth, wool production, posthitis, testosterone production and development of masculine characteristics

1992 ◽  
Vol 32 (4) ◽  
pp. 443 ◽  
Author(s):  
DL Hopkins ◽  
RB Jackson ◽  
AHK Roberts
Keyword(s):  
Rank Correlation ◽  
Asymmetric Distribution ◽  
Lower Prevalence ◽  
Blood Samples ◽  
Wool Production ◽  
Testosterone Levels ◽  
Testosterone Production ◽  
Testicular Size ◽  
Wool Quality ◽  
Horn Development

Male lambs born to Merino, Polwarth and Merino x Polwarth ewes were used to study a technique for manipulating testicular size. Of these lambs, 82 were castrated at marking (wethers). For the remaining 100 the testicular parenchyma was removed at marking and then, at a subsequent date, the scrotal sac and any large testicles were removed (modified cryptorchids). Cryptorchids were significantly (P<0.05) heavier than wethers throughout the study and produced significantly (P<0.05) heavier fleeces (4.3 � 0.08 v. 4.0 � 0.06 kg). Bin class, as an indicator of wool quality, was not significantly different between the 2 groups. At all times of the year, cryptorchids had a significantly lower prevalence (P<0.001) and severity of posthitis. Posthitis increased in spring and decreased in summer. There was significantly (P<0.001) more horn development in the cryptorchids, and Merino-sired animals had more horn development than those sired by Polwarth rams. The basal level of testosterone in the wethers was 0.08 � 0.07 ng/mL averaged over 3 successive blood samples, compared to the cryptorchids at 0.95 � 0.16 ng/mL with an asymmetric distribution. The rank correlation between average testosterone levels and testicle score was significant (P<0.05) with a coefficient of 0.54. The rank correlations between testosterone levels and fleeceweight, liveweight or horn score were not significant (P>0.05).

scholarly journals Gestational and lactational exposure of rats to xenoestrogens results in reduced testicular size and sperm production.

1995 ◽  
Vol 103 (12) ◽  
pp. 1136-1143 ◽  
Author(s):  
R M Sharpe ◽  
J S Fisher ◽  
M M Millar ◽  
S Jobling ◽  
J P Sumpter
Keyword(s):  
Sperm Production ◽  
Lactational Exposure ◽  
Testicular Size

Exercise and temperature effects on human sperm production and testosterone levels

1984 ◽  
Vol 16 (1) ◽  
pp. 51???55 ◽  
Author(s):  
TIMOTHY R. McCONNELL ◽  
WAYNE E. SINNING
Keyword(s):  
Temperature Effects ◽  
Human Sperm ◽  
Sperm Production ◽  
Testosterone Levels

EVALUATING THE EFFECT OF IMPROVING SPERM PRODUCTION OF VIETNAMESE DEER ANTLER ON EXPERIMENTAL ANIMALS// Academy Journal No.10(12), 2018. pp. 8-27

2018 ◽  
Author(s):  
Liudmila Vyacheslavovna Fomina ◽  
Duy Bac Nguyen ◽  
Xuan Phong Pham ◽  
Hoang Ngan Nguyen
Keyword(s):  
Valproic Acid ◽  
Sperm Count ◽  
Serum Testosterone ◽  
Reproductive Organs ◽  
Male Rat ◽  
Sperm Production ◽  
Deer Antler ◽  
Experimental Animals ◽  
Testosterone Levels ◽  
Testicular Histology

The study was conducted to evaluate the effects of improving sperm production with the use of Vietnamese deer antler velvet powder on a white rat, whose sperm count was decreased by valproic acid. The findings showed that using deer antler velvet powder at doses of 127.5 mg/kg/24 hrs, 255 mg/kg/24 hrs and 510 mg/kg/24 hrs for 6 weeks on the male rat having a low sperm count recovered the research parameters (serum testosterone levels, sperm quantity and quality, reproductive organs and testicular histology).

Maturity stage and plasma testosterone levels are related to sperm production in blue catfish,Ictalurus furcatus.

2011 ◽  
Vol 44 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Nagaraj G. Chatakondi ◽  
Kenneth B. Davis
Keyword(s):  
Plasma Testosterone ◽  
Maturity Stage ◽  
Ictalurus Furcatus ◽  
Sperm Production ◽  
Blue Catfish ◽  
Testosterone Levels

Lupin and cowpea supplements for growth, wool production, and reproduction in rams

1995 ◽  
Vol 35 (4) ◽  
pp. 447 ◽  
Author(s):  
CC Pomares ◽  
DB Galloway ◽  
JHG Holmes ◽  
IJ Clarke ◽  
AJ Tilbrook
Keyword(s):  
Volume Concentration ◽  
Testicular Tissue ◽  
Grain Legume ◽  
Sperm Production ◽  
Cell Nuclei ◽  
Cross Sectional ◽  
Wool Growth ◽  
Condition Score ◽  
Testicular Size ◽  
Australian Merino

Lupins and cowpeas were fed at 0.0, 0.5, 1.0, and 2.0% liveweight (LW) to groups of 6 or 7 South Australian Merino rams for 11 weeks as supplements to a maintenance diet of grass hay. Productive and reproductive parameters were examined. Supplementation at all levels of either grain increased (P<0.001) LW, condition score, backfat thickness, and wool growth, with rams showing similar responses when given cowpeas and lupins. The weights of the pancreas of rams decreased (P<0.01) as the levels of supplementation increased. Semen characteristics (volume, concentration, motility, etc.) and response to freezing did not differ between the diets. Feeding either legume increased (P<0.001) testicular size, lupins giving a slightly greater response than cowpeas. Sperm production per g testicular tissue was not significantly altered. Increasing levels of either supplement increased (P<0.001) the weights of the seminal vesicles, more (P<0.01) so with lupins. The same effects occurred with the weight of epididymides except for rams fed cowpeas at the highest level. Histologically, the testes revealed an increase (P<0.001) in the number of round spermatogenic cell nuclei and the cross-sectional diameter of stage 8 tubules in rams after legume grain supplementation at 2.0% LW compared with controls. The response was higher in lupin-fed rams (P<0.05). Plasma luteinising hormone (LH) and follicle stimulating hormone (FSH) were measured in rams fed at maintenance or with lupins or cowpeas at 2.0% LW. Rams responded equally to all legumes. Concentrations of LH in peripheral blood increased (P<0.001) by 140% and FSH concentrations were elevated (P<0.01) 4-fold. Cowpeas, a tropical grain legume similar in nutrient composition to lupins, have similar potential when used as a supplement to improve productive and reproductive capabilities of Merino rams.

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